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The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 24% of the cars are older than

The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 24% of the cars are older than 21.2 years, find the standard deviation. Round z-value calculations to 2 decimal places and final answer to 2 decimal places.

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